Lock-nut.



. UNITED s'rATns PATENT OFFICE.

JOHN'LEWIS LARRAD, OF BEXHILL, ENGLAND.

LOCK-NUT.

Specification of Letters latent.

Application flled December 31, 1910. Serial No; 600,288..

nut to take the strain and a lock-nutof particular construction to'engage with the primary nut.

The inventlon will be best understood by reference to the accompanying drawings in which:

Figure 1 is a view of a bolt with the two nuts partly in section upon it; Fig. 2 shows a modification.

Like letters represent like parts'in both gures.

A is the bolt, B the primary-nut and C the lock-nut. Thebolt A is of usual construction and needs no description. The not B has a slightly conical recess D into which 5 the split extension or sleeve E ofthe' nut C enters. The sleeve E is split longitudinally,

as at E, in preferably four places, so that the portions or tongues of the collar can be compressed upon the bolt. The nut C and sleeve E are screw threaded throughout their length, and screw on to the bolt, as shown, the split portion of E having a raised collar or peripheral rim F, which when the lock nut is screwed into the primary nut-engages with the tapered recess D and compresses the tongues of E so as to secure a firm grip by the latter upon the bolt. The-rim F should be placed between the ends of the sleeve E, the best position being centrally between the; ends so as to insure the tongues being pressed equally upon the bolt and not merely at their outer ends. This enlargement F is an important feature of the invention, since while insuring the grip of the lock-nut upon the bolt when the two nuts approach each other, it does not engage so strongly with the wall of the conical recess D as to prevent. relative movement of the two nuts. The result of this is that should the primary nut slack back owing to vibration or other causes, it will turn upon the lock-nut, though the locknut will not-turn upon the bolt and consequently any tendency of the primary nut to slack back insures a firmer grip of the lockalso nut-upon the bolt and consequently still illllllllel prevents the lock-nut from slacking The arrangement in Fig. 2 is the same as that of Fig. 1, excepting that the collar F instead ofbeing upon theoutside of the split sleeve E is upon the inside of the recess D E being consequently coned instead of the recess D. The outside diameter of the end of E is a little less than-the inter? nal diameter of F, so that these parts may Patented May 7, 1912. w

notengage until about the longitudinal cen- I ter of the sleeve as above explained. The operation is exactly the same as first described. Should the screwed portion of the" nut B not be long enough'for the required strain, the nut may be lengthened, or what amounts to the same thing, the recess D may be formed in a projecting sleeve or cxten-- sion upon the outer end of the nut.

In using the invention, the nut B is first screwed down upon the bolt, stud, etc., to fix the work; then the -lock-nut is screwed down, its raised collar F compressing the tongues ofthe split sleeve E tightly upon the bolt, whereby the efiicient locking of both nuts is efii'ected. I

I wish it to be understood that the collar F is essential to the efficient working of this invention and that the mere tapering of the sleeve E to match the taper of the conical recess D would notbe an efficient carrying out of the invention, for the simple reason that with such 'an arrangement the nuts would hold to each other more tightly than either of them would hold to-the bolt and consequently vibration would be likely to cause both the nuts to unscrew.

What I claim as my invention and to secure by Letters Patent is 1-. A nut lock comprising a nut having a recess, a lock nut havin a split sleeve extension, and a rib on sai extension adapted to engage the wall of the recess between the ends of said recess one of said parts having a longitudinal taper to effect the compression ofthe sleeve when screwed'into the recess of the nut; substantially as described.

2. A nut lock comprising a nut having a recess, a lock nut having a split sleeve extension, and a rib projecting fromthe wall of said recess to engage the extension bedesire tween the end of: said extension and its juncthe recess of the nut; substantially as described.

3. A nut lock comprising a threaded nut, a screw arranged to receive said nut, said 5 nut having a tapered recess-in its outer face, a lock nut having a split sleeve extension arranged to enter said recess, and arib on said extension arranged to engage the tapered wall of the recess, the frictional en- ":0 gagement between the rib and the wall of JOHN LEWIS LARRAD. Witnesses H. D. JAMESON, l R. WILSON.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washingtb 1L0. 

